#!/bin/bash

# the sed 'I' command prints the hidden characters, for example '\t' for tab , '$' for end of line 

# execute the sed 'I' command will display \t for tab, $ for EOL
sed -n 'l' ./test_tabfile.txt
echo -e '\n'

# specify a number followed by I command, sed prints a line with at most 19characters followed
# by \ if there're rest characters exist.
sed -n 'l 6' ./test_tabfile.txt
echo -e '\n'
